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High severity7.3NVD Advisory· Published Dec 22, 2021· Updated Jun 17, 2026

CVE-2021-37706

CVE-2021-37706

Description

PJSIP is a free and open source multimedia communication library written in C language implementing standard based protocols such as SIP, SDP, RTP, STUN, TURN, and ICE. In affected versions if the incoming STUN message contains an ERROR-CODE attribute, the header length is not checked before performing a subtraction operation, potentially resulting in an integer underflow scenario. This issue affects all users that use STUN. A malicious actor located within the victim’s network may forge and send a specially crafted UDP (STUN) message that could remotely execute arbitrary code on the victim’s machine. Users are advised to upgrade as soon as possible. There are no known workarounds.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected products

21
  • Asterisk/Certified Asterisk14 versions
    cpe:2.3:a:asterisk:certified_asterisk:*:*:*:*:*:*:*:*+ 13 more
    • cpe:2.3:a:asterisk:certified_asterisk:*:*:*:*:*:*:*:*range: <16.8.0
    • cpe:2.3:a:asterisk:certified_asterisk:16.8.0:*:*:*:*:*:*:*
    • cpe:2.3:a:asterisk:certified_asterisk:16.8.0:cert10:*:*:*:*:*:*
    • cpe:2.3:a:asterisk:certified_asterisk:16.8.0:cert11:*:*:*:*:*:*
    • cpe:2.3:a:asterisk:certified_asterisk:16.8.0:cert12:*:*:*:*:*:*
    • cpe:2.3:a:asterisk:certified_asterisk:16.8.0:cert1:*:*:*:*:*:*
    • cpe:2.3:a:asterisk:certified_asterisk:16.8.0:cert2:*:*:*:*:*:*
    • cpe:2.3:a:asterisk:certified_asterisk:16.8.0:cert3:*:*:*:*:*:*
    • cpe:2.3:a:asterisk:certified_asterisk:16.8.0:cert4:*:*:*:*:*:*
    • cpe:2.3:a:asterisk:certified_asterisk:16.8.0:cert5:*:*:*:*:*:*
    • cpe:2.3:a:asterisk:certified_asterisk:16.8.0:cert6:*:*:*:*:*:*
    • cpe:2.3:a:asterisk:certified_asterisk:16.8.0:cert7:*:*:*:*:*:*
    • cpe:2.3:a:asterisk:certified_asterisk:16.8.0:cert8:*:*:*:*:*:*
    • cpe:2.3:a:asterisk:certified_asterisk:16.8.0:cert9:*:*:*:*:*:*
  • Freepbx/Asterisk
    cpe:2.3:a:sangoma:asterisk:*:*:*:*:*:*:*:*
    Range: >=16.0.0,<16.24.1
  • Pjsip/Pjsip
    cpe:2.3:a:teluu:pjsip:*:*:*:*:*:*:*:*
    Range: <=2.11.1
  • Debian/linux2 versions
    cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*+ 1 more
    • cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
    • cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
  • Pjsip/Pjprojectllm-fuzzy2 versions
    (expand)+ 1 more
    • (no CPE)
    • (no CPE)range: <= 2.11.1
  • osv-coords
    pkg:deb/ubuntu/[email protected]~ds2-1.3ubuntu0.1?arch=source&distro=mantic
    Range: < 20230206.0~ds2-1.3ubuntu0.1

Patches

Vulnerability mechanics

References

10

News mentions

0

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